One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(18,22)(19,25)(21,26)(23,30)(27,31)(28,32) involution — undirected(1,3,7,4)(2,5,8,6)(9,10)(11,15)(12,14)(13,16)(17,18)(19,23)(20,22)(21,24)(25,31)(26,29)(27,28)(30,32)(1,4,7,3)(2,5,8,6)(9,11)(10,13)(12,16)(14,15)(17,19,26,32,20,28,21,25)(18,23,29,30,22,27,24,31)(1,5,7,6)(2,3,8,4)(11,16)(13,15)(17,18)(19,27)(20,22)(21,24)(23,28)(25,30)(26,29)(31,32)(1,6,7,5)(2,3,8,4)(10,14)(13,15)(18,22)(23,27)(24,29)(30,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.